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T O P I C R E V I E W
mingshum	Posted - 01/10/2009 : 17:44:09 If 1818 = rt where r and t are positive integers and r > t, which of the following could be the value of rt? A)18 B)36 C)108 D)162 E)324 I squared both sides of the equation and came up with 3 to the sixth power times 2= rt So I concluded that r = 3and t = 2 thus rt = 216 which is not a choice! The answer is 108. Where did my reasoning go wrong??
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mingshum	Posted - 01/10/2009 : 19:28:36 Thank you Mrspi!!! How could I have forgotten to simplify the radical!
Mrspi	Posted - 01/10/2009 : 18:19:08 quote: Originally posted by mingshum If 1818 = rt where r and t are positive integers and r > t, which of the following could be the value of rt? A)18 B)36 C)108 D)162 E)324 I squared both sides of the equation and came up with 3 to the sixth power times 2= rt So I concluded that r = 3and t = 2 thus rt = 216 which is not a choice! The answer is 108. Where did my reasoning go wrong?? Did you think about simplifying 18 18 18 18 = 18 9 * 2 18 18 = 1832 Or, 1818 = 542 Now... if this = r t, then r = 54 and t = 2 Looks to me like r = 54, and t = 2 So, what could be the value of rt?